Centrifugal pump



FIG. 1 is a front elevational view of a centrifugal pump showing my new design, the rear being a mirror image of the front shown;

FIG. 2 is a right side view thereof;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a centrifugal pump, as shown and described. 